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In addition, the password length of an Adobe account is restricted to 12 characters:

That hasn't been my experience. I changed mine today to a 40+ character password just fine.

That said, I was still a victim of the hack. Good thing I had a unique password that I didn't share with any accounts.

I changed mine to a 20 character pw, but couldn't login with it. I worked, when I entered only the first 12 characters.

You could try logging in with the first 12 characters.

That is correct, 1Password tells me that for my two accounts created in 2011 and 2012. (At least mine are 12 chars, and I always max them out)

Just reset my passwords to 32chars, which worked (both setting and logging in). (Now, wether or not all 32 chars are actually being used...)